Abstract
We demonstrate that a transparency window can be obtained within the absorptive dipole resonant regime, by slightly reducing the symmetric arrangement of a dipole-like bar grating covered by a waveguiding layer. The physical understanding is that, under the condition of reducing the grating symmetry, the lossy dipole plasmon resonance can be completely transferred into the waveguide mode in a way of destructive interference. In accompany with the tunable transparency window modulated by the symmetry-reduced displacement, an ultra high group index (slowing down the light) as well as a vortex distribution of the electromagnetic field is found.
Original language | English |
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Pages (from-to) | 7206-7211 |
Number of pages | 6 |
Journal | Optics Express |
Volume | 20 |
Issue number | 7 |
DOIs | |
Publication status | Published - 26 Mar 2012 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics